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Short-term Borrowings and Long-term Debt - Debt Transactions (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 2,000
General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount 1,400
Proceeds from issuance of long-term debt and capital securities, net 890
Proceeds form issuance of debt, amount to be disbursed or allocated to finance or refinance projects 296
Term Loan  
Debt Instrument [Line Items]  
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 250
Senior Notes | CERC  
Debt Instrument [Line Items]  
Interest Rate 0.70%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 1,200
Securitization Bonds | SIGECO  
Debt Instrument [Line Items]  
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees 337
Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs  
Debt Instrument [Line Items]  
Aggregate Principal Amount 5,571
General Mortgage Bonds 4.95% Due 2033 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest Rate 4.95%
General Mortgage Bonds 5.30% Due 2053 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 300
Interest Rate 5.30%
General Mortgage Bonds 5.20% Due 2028 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 500
Interest Rate 5.20%
Proceeds from issuance of long-term debt and capital securities, net $ 496
CERC Term Loan 5.25% Due 2024 | Term Loan | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount 500
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 500
CERC Term Loan 5.25% Due 2024 | Term Loan | CERC | SOFR  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 0.85%
CERC Senior Notes 5.25% Due 2028 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest Rate 525.00%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 308
Interest Payable 3
CERC Senior Notes 5.40% Due 2033 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest Rate 540.00%
CERC Senior Notes, 5.25% Due May 2028 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 300
Interest Rate 525.00%
CNP First Mortgage Bonds 4.98% Due 2028 | First Mortgage Bonds | SIGECO  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 100
Interest Rate 4.98%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 179
CNP First Mortgage Bonds 5.04% Due 2033 | First Mortgage Bonds | SIGECO  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 80
Interest Rate 504.00%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 179
CNP Term Loan 1.50% Due 2023  
Debt Instrument [Line Items]  
Aggregate Principal Amount 250
CNP Term Loan 1.50% Due 2023 | Term Loan  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 250
CNP Term Loan 1.50% Due 2023 | Term Loan | SOFR  
Debt Instrument [Line Items]  
Interest Rate 1.50%
Basis spread on variable rate (as a percent) 1.50%
CNP Securitization Bonds | Securitization Bonds | SIGECO  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 341
CNP Securitization Bonds | Securitization Bonds | SIGECO | Minimum  
Debt Instrument [Line Items]  
Interest Rate 5.026%
CNP Securitization Bonds | Securitization Bonds | SIGECO | Maximum  
Debt Instrument [Line Items]  
Interest Rate 5.172%
CNP Convertible Notes 4.25% Due 2026 | Convertible Notes  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 1,000
Interest Rate 4.25%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 985
CNP Senior Notes 5.25% Due 2026 | Senior Notes  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 400
Interest Rate 5.25%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 397
General Mortgage Bonds March Due 2023 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Proceeds from issuance of long-term debt and capital securities, net $ 593
CERC Senior Notes .70% due 2023 | Term Loan | CERC | SOFR  
Debt Instrument [Line Items]  
Adjustment to basis spread (as a percent) 0.10%
Term Loan Due February 2024 | Term Loan | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 500